Can I remove files from repository I forked, if I make no changes to them? Please refer to previous post for more context.

Hey everyone, so I wrote this post a short time ago, and now I have another question regarding the same repository. I would like to remove the themes that I haven't touched as I don't want to have to deal with maintaining them every time there is a Lemmy update. Is that something I am allowed to do? Is it considered a crappy thing to do to the other dev?

Thanks in advance for all your help!